人芽囊原虫是否具有致病性一直颇有争议，因为很多流行病学研究和实验动物研究得出了矛盾的结论。
The pathogenic potential of Blastocystis hominis is still controversial because many epidemiologic and experimental animal studies gave quite different conclusions.
拿破仑的死因一直颇有争议。
她采取的一些措施，比如关闭学校，一直颇有争议，但是她向前、坚持的风格为她的事业赢得了众多的信仰者。
Some of her initiatives, such as school closings, have been controversial, but her straight-ahead, can-do and will-do style has won legions of converts to her cause.
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